Carburetor



Patented May 10, l1927. i

WILLIAM GRIKSGHEIT, OE; DETROIT,` MIGHIGAN,

` .marmer-.0a

Applcatqnzlevd November 27192,2,v- Serilali-No.z603,637

AThe:` invention Arelates to carburetor's vand yhas-for itsmainobject,theprovisionwof a carburetor. ,hpa-ving. faynozzle V cominunieating ywith .the carburetor l outlet and Y extending into the.float. chamber, and `means,,within the float chamber anddependentupen-lthev suction elfectfof the fnozzleto effect'tlfielflow ofA. liquid fuell intoy .the 1ioat cl'iamberv from a lowerlevel. Anotherobject is'to ,provide .a` carburetor which can I-jbev readilyA adjustedto. ,op,e`rate,as -agravityfeedtype of carburetor in which thefliquidfuel flOWsinto the. float: chamber from. afhigherjlevel.

Ahlurtlier objects ofthe invention Areside in .the novel features-ofconstructionyanjd.coinbinations and. arrangementl of parts as increful-ly hereinafter setffortlrV Inf'the drawings:y f y Higures. l andV 2yare. transverse cross VSec- .tionsffthlo-ugh. cairburetor1 embodying myinventiontaken oii'the lines 11-'1a'nd 2,-2.

respectively e V llfigure-f3zisxacross 'section on 'the 'line 3-'3 ofFigure 1.

1 is the outlet in the carburetor body and 2the primary air inletcommunicating there-l with, both the outlet and inlet extendinglaterally with the inlet slightly lower than the outlet. 3 is thethrottle valve in the outlet, and 4 the choke valve in the inlet.

5 is a tube depending into `the float chamber f 6 located below theoutlet and inlet, and 7 is an upper tube telescopically engaging in theenlarged upper portion 8 of the tube 5. These two tubes form the fueldischarge conduit of the carburetor, the lower end of the tube 5 beingopen and the rear portion of the wall of the tube 7 havinglongitudinally spaced openings 9 for placing the interior of the tube incommunication with the outlet 1. 10 is a fuel valve extending axiallythrough the tubes 5 and 7 and also through the opening 11 in the bottomof the cup 12. y 13 is a vertically reciprocable plunger within thecylinder 14 formed in the carburetor body and sc located that theplunger in the primary air inlet, while the pressure vvalve throughythe', restrictedequalizing passage 415. The loweri'nostposition @if theplunger is `determi/ned'by means .fofthe coil ably engaging vthe borel18y y'in'l the plunger. 'lhejlower.,V end of fthek ,plunger .witht ekel'cepfcionV offthe rear portion is preferably "formed at an .angle,landthe rear' loweifeii'il portionis spaced abovei ythe upper A4end of 'the,tuba-5. Ywhen thepluilei'- isili its. lener- `mest position. l Also,the. upper ltube..7lras an;A opening 9. in communication withl theoutlet-when the plijinger'isiin its lowerilnost position.

"y Thelfuel valvelO yand lalso theupper tube 7V are .secured totheplunger .lto be.` raised and' lowered' therewith the arrangement vbesuch that as, the plunger rises, tlrepef- "f-ective area oftheolaenihg'llinc'reases as vdoes also the effective areas of the dischargeopenings 9. Furthermore, the effective area of the passage for theprimary air entering the outlet increases.

To secure the flow of liquid fuel into the float chamber from a lowerlevel, and in the present inst-ance from the liquid fuel supplyair-vented tank 19 which is located below the carburetor, the cup 12within the float chamber has an open upper end located above the llevelof the liquid fuel within the float chamber. and the bottom of this cupwhich is preferably rounded, located at a slight distance from the lowerend of the tube 5. This cup is mounted upon the hollow support 20 whichhas the. lateral openings 21 in its wall for placing the interior of thefloat chamber in communication with the opening 11 in the bottom of thecup. There is also the air vent opening 22 communicating with thevertical passage 23, which latter communicates with the interior of thefloat chamber through the lateral opening 24 near its bottom. Thepassage 23 is formed in 'a vertically extending boss V25 at one side ofthe float chamber, and the air vent opening 22 is located above thelevel of the liquid fuel in the float chamber. 26 is a suitable floatconnected to thek control valve 27 for maintaining a constant level inthe float chan'iber.

ln operation, the suction effect in the outlet l below the throttlevalve 3 which is produced by the suction producing means of thecarburetor is transmitted through the eX- posed opening or openings 9 inthe upper tube 7, thereby drawing the liquid fuel from the float chamberthrough the openings 21 and ll into the fuel discharge conduit, sinceair is admitted into the float chamber' through the opening 22, verticalpassage 23, and opening 2f-l-l Also, the suction effect is transferredto the space within the float chamber above the level of the liquid fueltherewithin by means of the cup l2 which has an yopen upper end, thissuction being sutlicient to draw the liquid fuel from the supply tanlr19 into the float chamber through the intermediate pipe connection, theamountl of air entering the float chamber' through the air vent opening22 being restricted sufficiently to permit of the necessary suction. Ithas been found desirable in practice to space the portion of the bottomof the cup 12 which is directly in line with the Wall of the tube 5approximately of an inch below the lower end of this wall, and to makethe opening 24 approximately of an inch in diameter.

The pressure in the outlet in rear of the throttle valve also controlsthe position of the plunger with the attached fuel valve and upper tube.

The cup may be vertically raised to bring its bottom into Contact Withthe lower end of the tube 5, at which time the carburetor is adapted tofunction as a gravity feed type of carburetor in which the liquid fuelflows into the iioat chamber from a higher level. This verticaladjustment of the cup may be secured by suitable means and as shown inthe present instance is accomplished by means of the rock arm 28engaging in a groove 29 inthe lower end of the support 20, the rock armbeing mounted upon the shaft 30 which is actuated by the lever-,31 whichmay be actuated from a remote point by a suitable connection 32.

What l claim as my invention is:

In a carburetor, a mixing chamber, a constant level chamber, a tubefixed in the wall of said mixing chamber and extending into saidconstant level chamber, an adjustable cup in said constant level chambersurrounding said tube, said tube being open to the atmosphere and havinga valve seat in its bottom, and a needle vvalve responsive to thedepression in said mixing chamber egrtending through said tube tocooperate with said valve seat, so that adjustment of said cupsimultaneously varies the free opening of the fuel vvpassage and the airpassage between the end of said tube and the bottom of said cup.

In testimony whereof l aiiix my signature.

WILLIAM GrRlKSCHEIT.

